A shotgun like the ME66 will not be a good choice for a spread-out source like a choir unless you're trying to pick out a single soloist standing in front of the group. It's pattern is just too tight for a group like that. The VideoMic suffers the same limitation. The ME62 is an omni and would be a possible choice mounted on a mic stand a few feet in front of the choir. It would have a smoother pickup of the entire group but since it is sensitive to sound from all directions it will also pick up audience coughs, room reflections, etc, The optimum option in the Sennheiser series would be the one you don't have - the ME64 cardioid. A hemispheric shaped pattern like that can pick up the whole choir smoothly but is less sensitive to sound coming from behind it so there wouldn't be as much room intruding.

I'm with Rob, with what you have, the H4n's internal mics are your best bet. Stick on a mic stand (with a shock mount) in front of and and slightly above the choir pointing towards the center of the group. Optimum positioning is a guessing game unless you can do a sound check. On a separate recorder (or track) you could put your omni pointing at the audience for ambient, applause, ect. .. if needed.

What does a shock mount that would isolate an H4n look like? I'd be interested for my H4n, but have never seen one. I appreciate the choir suggestions here, as I have to record a choir too. Thanks to all.

the coincident stereo mics on these recorders are ideal for recording choirs in stereo. Key to success is height, so you can look down slightly - a boom stand on full height will do the trick. As for isolation, three foam pads gaffe red to the stand feet will usually suffice. The room is a bit lopsided for a perfect result, but these compact recorders were designed originally to do this kind of recording! You'll probably find that the parallel walls will not give the choir the right 'lift' so some subtle reverb may help sweeten it up.

Stereo recording of real acoustic ensembles always sounds so good compared with using these devices on music groups with some amplified sources and a PA.

The 1/4"-20 stand mount adapter that comes with the Zoom H2.. fits in a SM57/58 sized mic's shock mount nicely. For instance the Shure A55M works great... don't know about the other Zoom recorders having the stand mount adapter but most Zooms and other PARs have the 1/4"-20 threaded insert. The stand mount adapter is nothing more than tapered plastic piece the shape of a H/H mic body with a 1/4"-20 stud at the larger end.

I use a RODE SM3 Shockmount tilted vertically on a mic stand along with the plastic handle thingy which comes with the H4N. Works fine on a static setup and I had all the bits already.

Not sure that I would want to use that if I was going to be moving about though, as the H4N is quite heavy and the plastic cone/thingy tends to shoogle downwards on the shock mount and can end up grounding on the SM3.